Roll crushing-machine.



T. L. 6a T. J. STURTBVANT. ROLL GRUSHING MACHINE.l APPLICATION FILEDAPR. 1, 190s.

1,045,454. Patented Nov.26, 1912.

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WIT/w55 l T. L. n Ti J. STRTEVANT. ROLL CRUSHING MACHINE. APPLIUATIONFILED APR. 1, 199s.

1,045,454. 1 V Patented Nov. 26, 1912.

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CDLUMBIA PLANQGRAPH C0.. WASHINGTON, D. c

T. L. & 'I'. J. STURTEVANT. ROLL GRUSHING MACHINE.

' APPLICATION FILED APILl, 1908.

1,045,454. Patented Nwze, 1912.

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WHA/E5 INVENTUM' DIUMBIA PLANOURAPH :0.,WASl-IINGTON. D. c.

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STATns PATE THOMAS LEGGETT sTURTnvANT, or OUINCY, ANI) THOMAS J.STURTEvANT, or WELLESLEY, MASSACHUSETTS, ASsIGNoRS To STURTEVANT MILLCOMPANY,

A CORPORATION OF'MAINE. Y

ROLL cRUsHING-MAOHINE.

Specification of Letters Patent.

Patented Nov. ae, 1912.

Application tiled-April 1, 1908. Serial N o. 424,570.

To all whom it may concern: Y v

Be it known that we, THOMAS. L. STURTE- vANT and THOMAS J. STURTEVANT,`citizens of the United States, residing, respectively, at Quincy andWellesley, in the county of Norfolk and State of Massachusetts, haveinvented or discovered certain lnew and useful Improvements in RollCrushing-Machines,

of which the following is a Specification, reference being had thereinto the accompanying drawings. v j j This invention relates to rollcrushing machines, and comprises certain improvements on the styles ofmachines shown and described in our Patents No. 77 9,662, granted J an.10, 1905, and No. 855,358, granted May 2s, 1907.

The object of the present invention is to provide roll crushing machineswhich may be constructed at very much less cost than similar machines ofthe same capacity heretofore in use, and which will also be stronger, soas to better resist the strains incidental to the crushing operations,and thereby render the machine moredurable, as also to maintain thenormal roll spring pressures.

In the accompanying drawings, Figure 1 is a plan view of one form ofroll crushing machine embodying the present invention.

Fig. 2 is a side view of the same, and Fig. 3l

is an end elevation of the same, partly in vertical section. Fig. 4 1sa. side View of a slightly different form of machine from that shown inFigs. 1, 2 and 3, and Fig. 5 is an end elevation, partly in verticalsection, of

the form of machine shown in Fig. 4.

Referring to the drawings, 12 denotes the side pieces of the machineframe, and these side pieces may be integral with the cross pieces orend pieces of the frame, as shown in Figs. 1, 2 and 3, or may be madeseparate from said cross pieces and end pieces and bolted thereto, asshown in Figs. 4 and 5. This sectional construction, as shown in Figs. 4and 5, is preferable for convenience in transportation, particularly 4inmountainous countries and over bad roads, in that the machine framesmaybe taken apart so that the individual pieces thereof can be morereadily carried. Each of the side pieces of the frame is constructedwith a central abutment 13 on the opposite sides of which the bearingboxes 14 for the shafts 15 are arranged; and said side pieces of theframe are notched or stepped at their opposite ends to provide recessesfor the reception of the hollow boxes or holders 16 in which are housedthe springs 17, which, acting on the said bearing boxes 14, serve toforce theY crushing rolls 18 yieldingly toward each other. This notchedor stepped construction of the side pieces of the frame is advantageousin that by this construction theframe may -be made shorter or `lowerthan it otherwise could be, and still provide proper vouter verticalshoulders or abutments on the side pieces of the frame against which thesaid boxes or holders 16 are held by the nuts 20 on the upper and lowertie rods 21 and 22 or 22a which pass, respectively, above and below theroll-Shaft bearing-boxes 14; so asto provide great strength for theshocks incidental tothe strain of the crushing operations, as also toprovide an even resistance to the pressure a'orded by the springs 17nested Within the boxes or holders 1G. The abutments 13 serve as rigidinner .supports for the bearing. boxes 14. j

The tires of the rolls 18 are preferably connected with the shaft lbymeans of expansible and contractible rings or roll hearts 19 interposedbetween conical or tapered portions of the shafts 15 and the tires ofsaid rolls, as fully shown and described in our application No. 871,177,filed April 80, 1907.

To pro-vide for the proper regulation of the crushing rolls, so thattheir faces may be in any desired proximity to each other, a series ofshims or adjusting plates 23 are interposed between the abutmentsl andthe bearing boxes 14, and also `preferably between the said bearingboxes and blocks or followers 24 against which the springs 17 abut.' Byremoving one or `more of'these shims or adjusting plates from oneV Sideof the bearing boxes and placing them on the other side thereof theworking positions of the rolls 18, to bring their faces nearer to orfarther from each other, may be varied, as will be understood, withoutvarying the stress of the springs 17 g but if it be desired to increaseor lessen the stress of the said springs a greater or lesser number ofthese shims or adjusting plates may be used at one side or the other ofeach bearing box, thereby compressing or relaxing the springs.

In otherv words, by inserting more of these against the bearing boxes oragainst tneb C b shims or adjusting plates be relaxed. To this end weprovide a series of bolts having heads at their inner ends which arereceived in recesses in the blocks or :followers 24: and which areprovided at their threaded Outer ends with nuts 26 which may be screwedup against the outer faces of the holders or housings 16 so as toWithdraw the blocks or followers 24 and thereby remove the pressure ofthe springs 17 from the bearing boxes 14:, or from the shims oradjusting plates interposed between said boxes and the blocks orfollowers 24; and the abutments 13.

The lower tie rods may be either of the round form shown in F ig. 5, orof the rectangular form shown in Fig. 3, in which latter the lower tierod 22a is represented as being bolted or riveted to a side piece of theframe, and is provided with an attached wearing plate 27 on which thebearing boxes 14 can slide back and forth as they vibrate more or lessin the crushing operation; while in the construction shown 1n rig. 5 thewear ing plate 28 rests directly on a side piece 12 of the frame.

To prevent dust or grit from the chamber of the mill from working intot-he bearings of the shafts, dust-collars 29 are provided, these collarsbeing yieldingly pressed outward against the bearing boxes by a springor springs interposed between the expansible rings or roll hearts 19 andthe dust collars; the latter of course rotating with the shafts and rollhearts and having a close sliding fit on the shafts, so as to preventdust or grit from passing at the points where they are located.

Owing to the fact that both crushing rolls of the present improvedmachines are yieldingly mounted in movable bearings and are pressedtoward each other by springs, the said rolls are evenly balanced sothat, when in operation, they move oppositely at equal distances at thesame and equal times. Thus in the operation of these balanced-rollcrushing machines the wear and strain is very much less than in what maybe termed plain roll crushing machines in which one roll is mounted infixed bearings and the other roll is movable toward and from saidfixed-bearing roll, as in such machine-s the rolls pound each otherseverely, having no balanced shock-absorbing capacities or movements, asin the balanced roll machines, and the wear and tear of the plain rollmachines is therefore very much greater than with the balanced rollmachines in which both rolls aremounted in movable bearings pressedtoward each other equally by springs.

The construction hereinbefore described provides a roll crushing machineof compact form and great strength and durability', as also a machinewhich may be made at very much less cost thansi-milar machines of thesame capacity hereto-fore in use, and also one that,because of theseparability of parts, is more conveniently portable than said similarprior machines.

Having thus described our invention, we claim and desire to securebyLetters Patent z- 1. A roll crushing machine of the bal-H anced type,.comprising a frame having shaft-supporting side-pieces which arecontinuouslongitudinally of the machine and which vside pieces areprovided with central abutments, combined with movable bearingboxeslocated o-n opposite sides of said abutments which oppose the movementsof said boxes toward each other, roll-carrying shafts journaled in saidboxes, oppositely-acting springs, one set acting on each of said boxes,for forcing the rolls carried by said shafts toward each other andserving to press said boxes toward the opposite sides of said abutments,holders for said springs, and tie rods located both above and below saidbearing boxes and serving to secure said holders in place. Y

2. In a roll-crushing machine of the balanced type, the combination`with a frame comprising continuous side-pieces having stepped orrecessed outer ends, of roll-can rying shafts, bearing-boxes in whichsaid shafts are journaled, oppositely-acting springs, one set acting Voneach of said boxes, for forcing the rolls carried by said shaft-s towardeach other, holders for said springs, said holders being formed separatefrom said side pieces `and being located in the recesses afforded by thestepped or recessed ends of the said side-pieces, and means for securingthe said holders in place.

3. In a roll crushing machine of the balanced type, the combination witha frame comprising continuous side-pieces having stepped or recessedouter ends, of two rollcarrying shafts, movable bearing-boxes in whichboth of said shafts are j ournaled, oppositely-acting springs, one setacting on each of said boxes, for vforcing the rolls carried by saidshafts toward each other, hold ers for said springs, said holders beingformed separate from said side pieces and being located in the recessesafforded by the steppedV or recessed ends of the saidsidepieces, andtie-rods, located both above and 1,045,1i5aV a below said bearing boxes,for securing the said holders in place.

t. In a roll-crushing machine, the combinat-ion with a suitable framecomprising continuous side pieces having central abutments, ofbearing-boxes located at opposite sides of said abutments, roll-carryingshafts journaled in said boxes, oppositely-acting springs, one set ofwhich acts on each of said boxes, for forcing the rolls carried by saidshafts toward each other, and shims or adjusting plates on both sides ofsaid bearing boxes and a part of which are interposed between the latterand said springs, and by which the positions of the rollcarrying shaftsand the rolls may be varied to locate the rolls nearer to or fartherfrom each other without varying the stress of said springs, or by theuse of a greater or lesser number of which the stress of said springsmay be varied.

5. In a roll-crushing machine, the combination with a suitable framecomprising continuous side pieces having abutments, of bearing boxeslocated on opposite sides of said abutments, roll-carrying shaftsjournaled in said boxes, oppositely-acting springs, one set of whichacts on each of said boxes, for forcing the rolls carried by said shaftstoward each other, shims or adjusting plates on both sides of saidbearingboxes and a part of which are interposed between the latter andsaid springs, and by which the positions of the roll-carrying shafts andthe rolls may be varied to locate the rolls nearer to or farther fromeach other without varying the stress of said springs, or by the use ofa greater or lesser number of which the stress of said springs may bevaried, followers by which the stress of the springs is conveyed to thesaid bearingeboxes, and means for withdrawing the said followers so asto relieve the pressure of said springs from the bearing-boxes and saidshims or adjusting plates when it is desired to remove or change thesaid boxes or shims.

6. In a rollecrushing machine of the balanced type, the combination witha frame comprising side-pieces which are continuous longitudinally andwhich have shoulders, at their outer ends, and central abutments, ofmovable bearing boxes located on opposite sides of said abutments,shafts journaled in said boxes, rolls carried by said shafts,oppositely-acting springs, one set of which acts on each of said boxes,and which are located near each end of each of said side-pieces, saidsprings serving to force the said rolls yieldingly toward each other,holders for said springs abutting against said outer end shoulders,randtie-rods for securing said holders in place.

7. In a balanced-roll crushing machine, the combination with a framecomprising side pieces which are continuous longitudinally and whichhave ends providing shoulders, roll-carrying shafts, movably-mountedbearing boxes in which said shafts are journaled, opposing springs ofequal power for forcing the rolls carried by said shafts toward eachother, one set of said springs act ing on each of said boxes, holders inwhich said springs are held, and means for secur ing said holders inplace on the said side pieces.

8. In a balanced-roll crushing-1nachine, the combination with a framecomprising side-pieces which are continuous longitudinally and whichhave outer end shoulders and central abutments, movable bearing boxessupported by said side pieces, rollcarrying shafts mounted in saidbearing boxes, oppositely-acting springs, one set of which acts on eachof said boxes, and which serve to force the rolls carried by said shaftstoward each other and toward said abutments, holders for said springs,said holders abutting against shoulders on said side pieces, and tierods for securing the said holders in place.

9. In a balanced-roll crushing-machine, the combination with a framecomprising side pieces which are continuous longitudi nally just belowthe horizontal plane of the shaft bearings and which have stepped o-rrecessed ends providing vertical shoulders, roll-carrying shafts,movably-mounted bearing boxes in which said shafts are journaled,opposing springs of equal power on 100 opposite sides of said shafts,for forcing the rolls carried by said shafts toward each other, holdersin which said springs are housed and which are located in the recessesafforded by the stepped or recessed ends of 105 the combination with aframe comprising lio side-pieces which are continuous longitudinallybelow the horizontal plane of the shaft bearings and which have steppedor recessed ends providing vertical shoulders, of movable bearing boxesmounted in the recesses M5 of said side-pieces, roll-carrying shaftsmounted in said bearings, oppositely-acting springs for forcing therolls carried by said shafts toward each other, one set of said springsacting on each of said bearing boxes, 120

holders in which said springs are housed and which holders abut againstthe said shoulders of said side pieces, and tie rods for securing thesaid holders in place.

l1. In a balanced-roll crushing-machine, 125

a frame comprising side-pieces which are continuo-us longitudinally andwhich have central abutments and stepped or recessed ends, boxes locatedin the recesses afforded by said stepped ends, oppositely acting 130springs housed insaid boxes, one set of said springs acting on each ofsaid boxes, and longitudinal tie-rods serving to hold said boxes againstshoulders or abutments afforded by said stepped or recessed ends;

'whereby compactness of construction of the machine is provided for.

12. A roll-crushing machine of the balanced type, comprising a iframehaving shaft-supporting side pieces which are continuous longitudinallyin a horizontal plane, and Which side pieces are each provided With acentral abutment, movable bearing boxes on opposite sides of saidabutments, and oppositely-acting balancing springs or forcing said boxestoward said abutments, combined With roll-carrying shafts journaled insaid boxes, and tie-rods located bo-th above and below said bearingboxes.

In testimony whereof We aiix our signatures, in presence of twoWitnesses.

THOMAS LEGGETT STURTEVANT. THOMAS J. STURTEVANT. Witnesses:

L. H. STURTEVANT, R. M. GAY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

